csharp:A Custom CheckedListBox with Datasource

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/// <summary>    /// (eraghi)    /// Custom CheckedListBox with binding facilities (Value property)    /// from A Custom CheckedListBox with Datasource  http://www.codeproject.com/Articles/22960/A-Custom-CheckedListBox-with-Datasource-Implementa    /// </summary>    [ToolboxBitmap(typeof(CheckedListBox))]    public class DuCheckedListBox : CheckedListBox    {        /// <summary>        /// Default constructor        /// </summary>        public DuCheckedListBox()        {            this.CheckOnClick = true;          }              /// <summary>        ///    Gets or sets the property to display for this CustomControls.CheckedListBox.        ///        /// Returns:        ///     A System.String specifying the name of an object property that is contained        ///     in the collection specified by the CustomControls.CheckedListBox.DataSource        ///     property. The default is an empty string ("").        /// </summary>        [DefaultValue("")]        [TypeConverter("System.Windows.Forms.Design.DataMemberFieldConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3de65a4a-2b5f-4d9d-88de-bfb692b10f93")]        [Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3de65a4a-2b5f-4d9d-88de-bfb692b10f93", typeof(UITypeEditor))]        [Browsable(true)]        public new string DisplayMember        {            get            {                return base.DisplayMember;            }            set            {                base.DisplayMember = value;              }        }          /// <summary>        ///    Gets or sets the property to get the values for this CustomControls.CheckedListBox.        ///        /// Returns:        ///     A System.String specifying the name of an object property that is contained        ///     in the collection specified by the CustomControls.CheckedListBox.DataSource        ///     property. The default is an empty string ("").        /// </summary>        [DefaultValue("")]        [TypeConverter("System.Windows.Forms.Design.DataMemberFieldConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3de65a4a-2b5f-4d9d-88de-bfb692b10f93")]        [Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3de65a4a-2b5f-4d9d-88de-bfb692b10f93", typeof(UITypeEditor))]        [Browsable(true)]        public new string ValueMember        {            get            {                return base.ValueMember;            }            set            {                base.ValueMember = value;              }        }            /// <summary>        /// Gets or sets the data source for this CustomControls.CheckedListBox.        /// Returns:        ///    An object that implements the System.Collections.IList or System.ComponentModel.IListSource        ///    interfaces, such as a System.Data.DataSet or an System.Array. The default        ///    is null.        ///        ///Exceptions:        ///  System.ArgumentException:        ///    The assigned value does not implement the System.Collections.IList or System.ComponentModel.IListSource        ///    interfaces.        /// </summary>        [DefaultValue("")]        [AttributeProvider(typeof(IListSource))]        [RefreshProperties(RefreshProperties.All)]        [Browsable(true)]        public new object DataSource        {            get            {                return base.DataSource;            }            set            {                base.DataSource = value;              }        }          /// <summary>        /// Gets and sets an integer array of the values based on checked items values ID        /// </summary>        [Bindable(true), Browsable(true)]        public List<int> ValueList        {            get            {                ///Gets checked items id values in a list                List<int> retArray = new List<int>();                PropertyDescriptor prop = null;                PropertyDescriptorCollection propList = this.DataManager.GetItemProperties();                prop = propList.Find(this.ValueMember, false);                object checkedItem;                if (prop != null)                {                    for (int i = 0; i < this.Items.Count; i++)                    {                        if (this.GetItemChecked(i))                        {                            checkedItem = this.DataManager.List[i];                            retArray.Add(Convert.ToInt32(prop.GetValue(checkedItem).ToString()));                        }                    }                }                return retArray;            }              set            {                ///Sets checked items base on id values in a list                List<int> myList = value;                PropertyDescriptor prop = null;                PropertyDescriptorCollection propList = this.DataManager.GetItemProperties();                prop = propList.Find(this.ValueMember, false);                object checkedItem;                int intValItem;                int found;                if (prop != null)                {                    for (int i = 0; i < this.Items.Count; i++)                    {                        checkedItem = this.DataManager.List[i];                        intValItem = Convert.ToInt32(prop.GetValue(checkedItem).ToString());                        found = (from c in myList where c == intValItem select c).Count();                        if (found == 1)                            this.SetItemCheckState(i, CheckState.Checked);                        else                            this.SetItemCheckState(i, CheckState.Unchecked);                    }                }            }        }    }

　　测试:

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DataTable setData() {     DataTable dt = new DataTable();     dt.Columns.Add("ID", typeof(int));     dt.Columns.Add("Name", typeof(string));     dt.Rows.Add(1, "涂聚文");     dt.Rows.Add(2, "Geovin Du");     dt.Rows.Add(3, "geovindu");     dt.Rows.Add(4, "涂鸦王国");     dt.Rows.Add(5, "涂氏");     dt.Rows.Add(6, "张氏");     dt.Rows.Add(7, "郭氏");     dt.Rows.Add(8, "江氏");     return dt; }   /// <summary> /// /// </summary> public CheckedlistboxForm() {     InitializeComponent(); } /// <summary> /// /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void CheckedlistboxForm_Load(object sender, EventArgs e) {     this.duCheckedListBox1.DataSource = setData();     this.duCheckedListBox1.DisplayMember = "Name";     this.duCheckedListBox1.ValueMember = "ID";     //设定     bool  insideCheckEveryOther = true;     for (int i = 0; i < duCheckedListBox1.Items.Count; i++)     {         // For every other item in the list, set as checked.         if ((i % 2) == 0)         {             // But for each other item that is to be checked, set as being in an             // indeterminate checked state.             if ((i % 4) == 0)                 duCheckedListBox1.SetItemCheckState(i, CheckState.Indeterminate);             else                 duCheckedListBox1.SetItemChecked(i, true);         }     }     insideCheckEveryOther = false;       } /// <summary> /// /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button1_Click(object sender, EventArgs e) {       IEnumerator myEnumerator;     myEnumerator = duCheckedListBox1.CheckedIndices.GetEnumerator();     int y;     //选择为全为无选     //while (myEnumerator.MoveNext() != false)     //{     //    y = (int)myEnumerator.Current;     //    duCheckedListBox1.SetItemChecked(y, false);     //}       //foreach (object itemChecked in duCheckedListBox1.CheckedItems)     //{     //    MessageBox.Show("Item with title: \"" + itemChecked.ToString() +     //            "\", is checked. Checked state is: " +     //            duCheckedListBox1.GetItemCheckState(duCheckedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");     //}       foreach (DataRowView itemChecked in duCheckedListBox1.CheckedItems)     {         MessageBox.Show("Item with title: \"" + itemChecked[0].ToString() + itemChecked[1].ToString() +                 "\", is checked. Checked state is: " +                 duCheckedListBox1.GetItemCheckState(duCheckedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");     } }

　　设置已选择项:

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//2. List<int> list; list = new List<int> { 1, 4 }; int value = 0; //for (int i = 0; i < duCheckedListBox1.Items.Count; i++) //{ //    DataRowView view = duCheckedListBox1.Items[i] as DataRowView; //    value = (int)view["ID"]; //    if (list.Contains(value)) //        duCheckedListBox1.SetItemChecked(i, true); //} for (int i = 0; i < duCheckedListBox1.Items.Count; i++) {     DataRowView view = duCheckedListBox1.Items[i] as DataRowView;     value = (int)view["ID"];     if (value == 5)         duCheckedListBox1.SetItemChecked(i, true); }